Bore reducing device for fire-arms



Aug. 11, 1959 -G.ISENUTOVITICH BORE REDUCING DEVICE FOR FIRE-ARMS Filed March a, 1957 E a 1 Q United States Patent 2,898,594 I LBQR BEDQQP GD Y E FOR -A Senutovitch, Montreal, Quebec, Canada Application March 8, 1957, Serial No. 644,840

3 Claims. (CI. 42-77) This invention relates to a bore reducing device for fire-arms and has special reference to a device which, when inserted in the cartridge chamber of a rifle or shot gun will enable the use of a. cartridge of much less bore than that normally employed in such a fire-arm.

' One important object of this invention is to provide a novel device of this character which may be inserted in the cartridge chamber of a standard type of fire-arm without any change of proportions or machining of any part of such a standard rifle or shot gun.

A second object of this invention is to provide a device of this character having a barrel, the axis of which will aline with the axis of the weapon in which it is inserted, thus enabling the sights of the original arm to be eflectively used in firing practice as sights for the insert.

A third important object of this invention is to provide novel means whereby a small bore cartridge may be supported and fired in a gun barrel of a larger bore, thus causing great economy in target practice, for hunting, shooting birds and animals. Further, the invention permits to use a rifle as a shot-gun and a shot-gun as a With the above and other objects in view, as will be presently apparent,'the invention consists in general of certain novel features of construction and combinations -of parts hereinafter fully described, illustrated in the :accompanying drawings and particularly claimed.

In the drawings like characters of reference indicate like parts in the several views, and:

Figure 1 is a side elevation of this invention with bar- 'rel in retracted position;

Figure 2 is an elevation taken from the right end of Figure 1; v

Figure 3 is a section on the line 3-3 of Figure 1;

Figure 4 is a section similar to Figure 3 but showing the barrel in protracted position;

Figure 5 is a face view of a certain washer forming part of the invention;

Figure 6 is a section on the line 66 of Figure 5;

Figure 7 is a fragmentary view disclosing the relation of a small bore cartridge to the washer of Figure 6; and

Figure 8 is a view similar to Figure 7 but showing a modification of the washer and gun barrel as used in this invention.

In the invention as shown in the drawings, there is provided a cartridge casing having a thin body It) and a thick base 11. This casing is of such size and shape as to fit snugly in the cartridge chamber of the firearm in which this device is to be used. Centrally of the base 11, there is provided an opening 12, of such size as to permit passage of the body of the small diameter cartridge to be used herein and an annular recess 13 surrounds the opening 12 to form a recess for the reception of the head of the small cartridge.

Slidably mounted in the body is a barrel having 2,898,694 Patented Aug. 11, 1959 ice as theexterior diameter of the casing 10,- thus providing a shoulder for limiting retraction of the barrel. At its rear end the body 14 isprovided'with an extension 16 of reduced diameter forming a spring seat shoulder 17, as will be presently understood. At its rear end the barrel is provided with a cartridge chamber 26 for the reception of the small cartridge to be used. (Not shown in Figures 3 and 4.) From the cartridge chamber 26, the barrel has a forwardly extending bore 18 which may or may not be provided with rifling, as desired.

In order to limit the protraction of the barrel from the casing 10, the latter is provided with a pair of angled slots 19, in which are slidably fitted the heads of screws 20, which are screwed into the body 14.

In the casing 10 is a washer 21, having an outside diameter to closely fit in the casing. This washer bears against the inner face of the head 11 and forms a spring seat for a coiled spring 22, which surrounds the barrel end 16 and seats forwardly on the shoulder 17. The central opening of the washer 21 is surrounded by a series of circumferentially spaced slits 23, so as to form spring segments 24, which extend forwardly from the washer as shown in Figure 4. When the barrel is retracted, as in Figure 3, the washer is flattened and the segments 24 grip the casing of the small cartridge 29 firmly. However, when the barrel is protracted these segments spring forwardly as in Figure 7 and release the small cartridge.

In the modification shown in Figure 8, the segments 25 are thickened as at 27 and the barrel end 16' is recessed at 28 to accommodate the thickened ends 27.

In use, the barrel is placed in the protracted position of Figure 4, the small cartridge is inserted after which the barrel is contracted in order that segments 24 engage the cartridge. Then the whole device is placed in the larger bore weapon. After firing, the device as a whole is ejected by the usual ejection device of the fire-arm being used. The casing 10 is grasped in one hand and the barrel 15 in the other hand. The barrel is turned in the casing 10 and allowed to protract as in Figure 4, thus permitting removal of the casing of the spent small cartridge.

Although specific embodiments of the invention have been illustrated and described, it will be understood that various alterations in the details of construction may be made without departing from the scope of the invention as indicated by the appended claims.

What I claim is:

1. In a bore reducing device for fire-arms, a casing adapted to fit in the rear end of a fire-arm barrel of standard bore, said casing having a base with a central opening for the insertion of a small bore cartridge, a barrel slidably mounted within said casing to move between retracted and protracted positions, said barrel having a rear end provided with a small bore cartridge chamber alined with said central opening in said base, protraction means urging the slidable barrel into protracted position, limit means connecting the casing and slidable barrel and restricting the extent of the barrel movement, and cartridge gripping means in said casing consisting of a washer fitting the casing and engaging the inner face of said base, said washer having a central opening registering with the central opening of said base and having spring segments which extend outwardly from the plane containing the peripheral portion of said washer when in normal released position and adapted to be flattened by the barrel into cartridge gripping position when said barrel is in retracted position.

'2. 'In a'bore reducing device as claimed in claim 1, wherein the rear portion of said slidable barrel is of reduced diameter, and said protraction means include a spring surrounding said portion of reduced diameter and fitted within said casing and seated onsaid Washer atone end and on the shoulder of said barrel defined by-said portion ofreduced diameter at the other end to allow contact between said washer-and the rear end face-of said barrelvin the retracted position of the -latter.

,3. In a bore reducing device as claimed in claim 1, wherein the base of said casing has a cartridgereceiving r c s su roundingrsaid central opening.

UNITED STATES PATENTS Darrns Sept. 21, 1897 Sandine Nov. 3, 1936 Dial June 16, 1953 FOREIGN PATENTS Great Britain 1895 Great Britain 1909 Germany June 25, 1928 

